[Frictionlabs] Premium Chalk Disc

"Frictionlabs," a brand based in Colorado, USA, has earned high acclaim for using high-quality, simple magnesium carbonate—the kind typically used in chemical research.

It minimizes the amount of other compounds, such as calcium carbonate, to maintain a dry texture.

The set includes five 0.85 oz (approx. 24 g) disc-shaped chalk pieces, ideal for refilling your chalk.

By thoroughly crushing the chalk between your fingertips, you can apply it deeply into the creases of your fingers. It’s also great for marking tick marks.